Abstract
The effects of pea (Pisum sativum L.) seedling inoculation with nodule bacteria (Rhizobium leguminosarum bv. viceae) and hypothermia on the content of cytokinins (Ck) in seedling roots during 8 days after external factor action were studied. As soon as a day after inoculation with Rh. leguninosarum, the content of Ck in the seedling roots increased, especially in the root zone most susceptible to infection (0–20 mm from the tip); this not only affected growth of the whole roots but also determined the initiation of nodule primordia. Hypothermia (8°C) reduced the content of CK as soon as in a day. After 5 and 8 days of hypothermia, the content of Ck in inoculated plants was approximately twice higher than in non-inoculated plant roots.
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